intensity, and energy intensity is just another way of saying how much energy do you use for a given output of gdp so obviously that is not the same as a hard cap on carbon. but they are very aware of the need for a hard cap on carbon. i think they're going to start at 30%, going to move to 50% of the population in china by 2015, three years away. they are ahead of us and taking this seriously. >> tom, given where we are in the economy, tepid recovery at best, would you advocate for a carbon tax now? >> you know, i believe, i talked to a lot of people about the different ways to approach this, and that happens to be the one that is the flavor du jour. what i believe is that if we give people a direct organization of society, that's a bad phrase, if we give them, government's job is to describe what's important and if we describe the parameters for our economy, which is what the government's supposed to do, i believe the private sector will turn this inside out, will come up with stuff none of us have ever thought of and will make amazing things happen and be good for our economy. >>